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Place your hands on the back of your head, with the fingers interlocked, and the thumbs pointing down gently pressing/rubbing on your neck.

Slowly move your eyes to any fixed direction (say, to the right) and keep your eyes open, staring to the right.

This will initiate a yawn or deep sigh in most people, stimulating vagus nerve.

What kind of sorcery, i tried this and yawned within second.

Interesting, another poster called it sorcery but I tried it three times and nothing happened.

There is this technique: https://therapyinanutshell.com/vagus-nerve-exercise/ that seems to stimulate the vagus nerve.

Some kinds of meditation stimulate it. I've tried those.

Where did you hope to get?

Not GP, but there is

Not sure if this is a good idea though.